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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Dec. 31, 2014 contract rigs
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	70esv_TotalNumberOfContractDrillingRigs
Number of drilling management contracts	6esv_NumberOfDrillingManagementContracts
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	28esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	42esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
North & South America (Excluding Brazil) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	17esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember
North & South America (Excluding Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	9esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember
North & South America (Excluding Brazil) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_NorthSouthAmericaExclBrazilMember
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	15esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Middle East & Africa [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	11esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Asia & Pacific Rim [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	12esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Asia & Pacific Rim [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Asia & Pacific Rim [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	15esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember
Europe & Mediterranean [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	11esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_EuropeMediterraneanMember
Brazil [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = country_BR
Brazil [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = country_BR
Brazil [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = country_BR
Asia & Pacific Rim (Under Construction) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	5esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember
Asia & Pacific Rim (Under Construction) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember
Asia & Pacific Rim (Under Construction) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_AsiaUnderConstructionMember
Middle East Under Construction [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMember
Middle East Under Construction [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMember
Middle East Under Construction [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2esv_TotalNumberOfContractDrillingRigs / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember / us-gaap_StatementGeographicalAxis = esv_MiddleEastUnderConstructionMember

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